An Image Encryption Algorithm Based on Hyperchaotic System and Variable-Step Josephus Problem

Table 6

Entropies of original images and cipher images.

Images	Entropies
	Original images	Cipher images
Cameraman 128128	6.8794	7.9873
Cameraman 256256	6.9046	7.9976
Cameraman 512512	6.9102	7.9994
Brain 128128	4.9891	7.9854
Brain 256256	5.0330	7.9971
Brain 512512	5.4498	7.9993
White 128128	0	7.9891
White 256256	0	7.9973
White 512512	0	7.9993
Black 256256	0	7.9973